As the TMDs missions have been designed to carry on meteorological administrations and managements for the sakes of 2 vital aims: the best economic, social, agricultural, and industrial benefits as well as protection of human lives and properties possessed by public members; private sectors; and governmental units against natural disasters, it has been authorized to perform the following 5 duties :

1. To supply weather forecasts for the entire country and publicize disaster warnings to fulfill the requirement from administration and management in natural disaster mitigation,
2. To build the peoples awareness toward natural disasters; enable them to perform correct surviving practices; and reduce effects from natural disasters by using modern technologies together with IT services,
3. To become the meteorological IT data and service center at the national level for users in any ventures,
4. To improve and develop the Departments research works,
5. To strengthen the Departments roles in international cooperat ion concerning meteorology and environment with the purpose of profound comprehension on changing world situation.